Bump actions/checkout from 4 to 6 (#4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -12,6 +12,6 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: pipx run build
       - uses: pypa/gh-action-pypi-publish@v1.12.4